Unifix A2-304 St/st Woodscrews Pozi Csk Head 4.0 X 30mm - Silver

A Pozidriv head has four additional smaller notches between the main cross slots, which reduce cam-out (the driver bit slipping out of the screw head) compared to a Phillips head. You must use a PZ driver bit for a Pozidriv screw.

Yes, the A2-304 stainless steel construction is generally compatible with most types of treated timber.

Yes, the A2-304 stainless steel provides excellent resistance to corrosion, making them highly suitable for outdoor use.

Use a drill bit that is slightly smaller than the screw's core diameter. For a 4.0mm screw, a 2.5mm to 3.0mm drill bit is often suitable, depending on the wood type.

The quantity varies by packaging. Please check the product packaging or listing for the specific count.

Yes, the stainless steel surface can typically be painted or varnished after application, provided the surface is clean and prepared appropriately.

Ensure you are using the correct Pozidriv (PZ) bit. Verify the bit is fully engaged in the screw head and not worn. Reduce driving torque if using a power tool.

Drill a pilot hole. Ensure the pilot hole is the correct size for the screw shank and not too large.

While A2-304 stainless steel offers high corrosion resistance, it is not entirely immune in extremely harsh environments (e.g., constant salt spray or contact with dissimilar metals). Ensure screws are properly seated and not in prolonged contact with corrosive substances.